巴楚地区泥盆系东河塘组储集特征及控制因素

Reservoir characteristics and controlling factors of the Devonian Donghetang formation in Bachu area in Tarim Basin

根据岩心观察、镜下薄片鉴定、分析化验和测井解释等结果,分析巴楚地区泥盆系东河塘组储层岩石学、储集空间和物性特征.结果表明:东河塘组为高成分成熟度和高结构成熟度的石英砂岩,孔隙空间以溶蚀粒间孔为主要类型,储层物性以低孔低渗为特征;优质储层受沉积相带和成岩改造的双重控制,滨岸砂坝次生溶蚀孔隙发育,储层物性最好,含油气级别最高,储层反演预测显示在BK8井及其西北部地区是滨岸砂坝的主要发育区.

Based on core observation,thin section analysis,laboratory test,and well logging interpretation,reservoir petrology,reservoir space and physical property of the Donghetang Formation have been systematically analyzed.It is determined that the Donghetang Formation is mainly composed of silicarenite with high compositional maturity and textural maturity,the dissolution intergranular pore is the major types of the reservoir space,and the physical property is characterized by low porosity and permeability.The quality of reservoir is controlled by both sedimentary facies and diagenesis.The longshore bar sediment where dissolution pores are well developed has the best physical property and is in the highest hydrocarbon bearing level.The reservoir inversion forecasts show that longshore bar microfacies mainly developed in northeast to the BK8 well.